Drill-sharpener.



Patented Mar. 20, 1917! 3 SHEETS-SHEET I.

E. L. OLDHAM.

- DRILL SHARPENER.

APPLICATION men mm, I915- 1,219,478.

III"

I-llm EDWARD L. OLDI-IAM, OF DENVER,

MANUFACTURING COMPANY, WARE.

DRILL-SHARPENER.

Specification of Letters Patent.

COLORADO, ASSIGNOR TO THE DENVER ROCK DRILL OF DENVER, COLORADO, ACORPORATION OF DELA- ratemea Mal eatery.

Application filed April 5, 1915. Serial No. 19,316.

To all whom it may concern:

Be it known that I, EDWARD L. OLDHAM, a citizen of the United States,residing at Denver, in the county of Denver and State of Colorado,haveinvented new and useful Improvements in Drill-Sharpeners, of whichthe following is a specification. 1

The present invention relates more particularly to the means for shapingand sizing drill bits and the like, said mechanism being normallyassociated with the sharpening means for convenience and operation.

One of the principal objects of the present invention is to provide asimple, novel, and practicable structure, in which the coacting dies maybe initially separated in order that the bit may be easily placed inposition and thereafter the die mechanism may be set into operation, theentire operation being controlled in a simple and effective manner.

In the drawings Figure 1 is a side elevation of the preferred embodimentof sharpening apparat-us.

Fig. 2 is a vertical sectional view on the line 22 of Fig. 1.

Fig. 3 is a detail cross sectional view on the line 3-3 of Fig. 2.

Fig. 4 is a vertical sectional view on an. enlarged scale of the valvemechanism, with the ports shown diametrically opposite for illustrativepurposes, and

Fig. 5 is a horizontal sectional view on the line 5-5 of Fig. 1.

Similar reference numerals designate corresponding parts in all thefigures of the drawings.

In the embodiment base of the machine is designated disclosed, the bedor generally by the reference numeral 6, and mounted upon one side ofthe same is the die mechanism. To this end a guide yoke 7 is employedsuitably secured on the base or bed, and supporting a pair of coactingdie members 8 and 9. The lower of these die members 8 is suitably fixedagainst movement, while the upper member 9 is capable of verticalreciprocation, the yoke having guide flanges 10 on its rear side anddetachable plates 11 on its front side coacting therewith, formingguideways for said die 9.

Mounted in the upper end of the yoke 7 is an actuating motor, comprisinga cylinder member 12 in which operates a recipro-' catory piston 13having a piston rod 14:

cylinder member 12 I other'words, so that the upper surface projectingdownwardly beyond the cylinder member into the yoke, said piston rodbeing suitably secured to the (Lie 9, and thus causing its reciprocationon the reciprocation of the piston 13. t is believed to be unnecessaryto enter into a detailed description of the piston 13. It may be stated,however, that'it is provided with an internal constant pressure chamber15, into which motive fluid is introduced through a tube 16 extendinginwardly from the upper head of the cylinder member, the motive fluidbeing distributed from the chamber 15 to opposite pressure surfaces 17and 13 by suitable ports and passages in order to cause thereciprocation of the piston, and consequently the hammering action ofthe die 9. Briefly explained, the arrangement of the said ports and theoperation is as follows :-The chamber 15 of the piston has a reducedrear end 5, which snugly receives the front end of the tube 16, and saidtube 16 has a reduced portion 16. The cylinder member 12 has an annularinternal groove 12 in its lower portion with which communicates alongitudinal groove 13 formed in one side of the piston 13. A port 15",communicating with the internal constant pressure chamber 15, is alsoarranged to communicate with the groove 12. Another annular internalgroove 12 is formed in the cylinder member 12 and is in communicationwith a suitable exhaust port not shown.

WVith this arrangement, when motive fluid passes through the tube 16into the chamber 15, with the ports as shown in Fig. 2, said motivefluid will pass out through the port 15" and thence through the groove12 and groove 13 into the lower portion of the cylinder member 12, sothat it will operate against the surface 17 of the piston and cause theelevation of said piston, the exhaust above the piston escaping freelyfrom the exhaust groove 12*. When the piston is elevated, the reducedportion 15 piston will register with the reduced portion 16 of the tube16, and consequently the motive fluid will pass from the constantpressure chamber 15 around the tube 16 and enter the above the piston,or in 105 it will operate against 18 of said piston. The port 15 willnow be closed by the wall of the cylinder member 12 between the ports 12and 12*, but the necessary exhaust from 110 of said the lower end of thecylinder member can take place through the groove 13, the upper end ofwhich will be in communication with the exhaust groove 12 This operationwill be repeated, so that the piston will be reciprocated and of coursethe die member 9 moved with it. The supply port for delivering motivefluid to the tube 16 is shown at 19 in the upper head of the cylindermember, and another supply port 20 leads to the lower portion of thecylinder member beneath the lower pressure face 17. This latter port 20is for delivering a supplemental supply of fluid under pressure to thelower end of the piston, for the purpose of elevating the same, andthereby separating and holding separated the dies 8 and 9.

For the purpose of controlling the supply of fluid to the motor, themechanism hereinafter described is preferably employed. A valve casing21 is suitably mounted on the rear portion of the base of the machine,and as shown in Fig. 41, is provided with an internal annular groove 22,with which communicates a supply pipe 23 leading from any suitablesource of fluid under pressure. Another groove 24: is located within thecasing 21 above the groove 22, and from the groove 24, a pipe 25 leadsto the inlet port 19 for the actuating fluid of the motor. Below thegroove 22 an outlet port 26 is in communication with a pipe 27 whichleads to the supplemental port 20 in the cylinder member 12 of themotor. Mounted to reciprocate in the chamber 28 of the casing 21 is apiston valve, comprising an upper head 29 and a lower head 30 connectedby a neck 31. The lower head is provided with an annular groove 32 incommunication with the space surrounding the neck 31, through the mediumof a port 33. This piston valve is provided with a stem 31- extendingdownwardly through and below the lower end of the valve casing 21, whereit rests upon the rear end of a treadle lever 35 fulcrumed between itsends, as shown at 36 on the base of the machine, and having a treadleplate 37 on its front end. A coiled spring 38 surrounds the projectingend of the valve stem 34, the upper end of this spring bearing againstthe lower head 39 of the valve casing, while the lower end of saidspring bears upon a. collar 10 secured to the valve stem. The springthus tends to normally move the valve to its lowermost position. Aspring-pressed holding dog 41 is mounted in the lower valve casing head39, and has a tapered inner end arranged to engage in a groove 12 formedin the portion of the valve stem 34 that is slidable in the head 39.

Briefly described, the operation of the apparatus is as follows: Whenthe parts are in the position shown in Figs. 1, 2 and 41, even thoughair or other fluid under pressure be supplied to the pipe 23, it will beevident that this supply will be entirely out off from the motor.Assuming now that it is desired to introduce a bit between the dies andoperate upon the same,the workman places his foot upon the treadle 37and moves the samedownwardly a short distance. As a result the pistonvalve will be elevated until the groove 32 of the lower head 30registers with the outlet port 26, and thereupon the fluid underpressure will pass through the ports 33 and 26 into the pipe 27, andwill enter the cylinder member 12 below the piston, thereby raising saidpiston and conse quently moving the die 9 upwardly from the die 8. Thisfluid will hold the dies separated. The workman thereupon introduces thebit into the proper die seats, and having properly positioned the same,presses the treadle plate 37 farther downwardly. The groove 32 will thenbe carried above and out of communication with the port 26, but

the head 29 being also moved upwardly above the groove 24, communicationbetween the grooves 22 and 24 will be established. As a result, motivefluid will pass into the pipe 25, and thence to the supply port 19 ofthe motor, entering the constant pressure chamber 15 of the piston. Fromthis pressure chamber, it will be distributed in a manner wellunderstood to cause the reciprocation of the piston and consequently thehammering action of the dies. Having completed this operation, theoperator releases the treadle 37, whereupon the piston valve will movedownwardly,the groove 32 will again be brought into register with theport 26, and fluid under pressure will conse quently enter the lower endof the cylinder member and raise the piston, thereby again opening thedies to permit the ready removal of the tool.

From the foregoing, it is thought that the construction, operation andmany advan tages of the herein described invention will be apparent tothose skilled in the art, without further description, and it will beunderstood that various changes in the size,

shape, proportion and minor details of construction may be resorted towithout departing from the spirit or sacrificing any of the advantagesof the invention.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is

1. In apparatus of the character set forth, coacting die members, amotor for operating the same, means for supplying motive fluid underpressure to the motor and distributing it therein to repeatedly actuateit, means for V the same, means for supplying motive fluid underpressure to the motor and distributing it therein to repeatedly actuateit, means for supplying motive fluid under pressure to the motor to holdit in position with the dies separated, and a common valve forconsecutively controlling bot-h fluid supplies.

3. In apparatus of the character set forth, coacting die members, amotor for operating the same, means for supplying motive fluid underpressure to the motor and distributing it therein to repeatedly actuateit, means for supplying motive fluid under pressure to the motor to holdit in position with the dies separated, and common means for controllingboth fluid supplies and admitting the motive fluid first to the motor toseparate the dies and afterward to the motor to repeatedly actuate thesame.

d. In apparatus of'the character set forth, coacting die members, amotorcomprising a cylinder member and a piston operating therein, means forsupplying motive fluid toopposite faces of the piston in the cylindermember to repeatedly actuate the piston, means for also supplying motivefluid under pressure to the piston for moving the same and holding it ina position with the dies separated, and means for controlling thesupplies of actuating fluid and holding fluid.

5. In apparatus of the character set forth, coacting die members, amotor comprising a cylinder member and a piston operating therein, meansfor supplying motive fluid to opposite faces of the piston in thecylinder member to repeatedly actuate the piston, means for alsosupplying motive fluid under pressure to the piston for moving the sameand holding it in a position with the dies separated, and a common valvefor controlling the supply of actuating fluid and the supply of theholding fluid.

(3. In apparatus of the character set forth, coacting die members, amotor comprising a cylinder member and a piston operating therein, meansfor supplying motive fluid to opposite faces of the piston in thecylinder member to repeatedly actuate the piston, means for alsosupplying motive fluid under pressure to the piston for moving the sameand holding it in a position with the dies separated, and a valve havinga back and forth movement and successively admitting fluid to theholding supply means and then to the actuating supply means.

7. In apparatus of the character set forth,

- the combination with coacting die members,

of a motor for actuating the same, comprising a cylinder member and apiston operating therein and having opposing surfaces against whichmotive fluid is brought to' actuate the piston, means for supplyingmotive fluid to the cylinder member and distribut- Copies of this patentmay be obtained for ing it to the opposing surfaces to actuate thepiston, and means for admitting a supplemental supply of fluid underpressure against a surface to move the piston in a direction to separatethe dies and hold the same separated.

8. In apparatus of the character set forth, the combination withcoacting die members, of a motor for actuating the same, comprising acylinder member and a piston operating therein and having opposingsurfaces against which motive fluid is brought to actuate the piston,means for supplying motive fluid to the cylinder member and distributingit to the opposing surfaces to actuate the piston, means for admitting asupplemental supply of fluid under pressure against a surface to movethe piston in a direction to separate the dies and hold the sameseparated, and a common valve controlling both supplies.

9. In apparatus of the character set forth, the combination withcoacting die members, of a motor for actuating the same comprising acylinder member and a piston operating therein and having opposingsurfaces against which motive fluid is brought to actuate the piston,means for supplying motive fluid to the cylinder member and distributingit to the opposing surfaces to actuate the piston, means for admitting asupplemental supply of fluid under pressure against a surface to movethe piston in a direction to separate the dies and hold the sameseparated, and a common valve movable in opposite directions forcontrolling both fluid supplies and admitting fluid alternately thereto.

10. In apparatus of the character set forth, the combination withcoacting die members, of a motor for actuating the same comprising acylinder member and a piston operating therein and having opposingsurfaces against which motive fluid is brought to actuate the piston,means for supplying motive fluid to the cylinder member and distributingit to the opposing surfaces to actuate the piston, a valve casing havingan admission port and spaced outlets, one of said outlets leading tosaid motive fluid supply of the cylinder member, the other leading to apressure surface of the piston, and a piston valve in the casing havinga plurality of channels communicating with the fluid supply andalternately movable into communication with said outlets.

In testimony whereof I have hereunto set my hand in presence of twosubscribing'witnesses.

EDWARD L. OLDHAM. W'itnesses:

F. L. EMERSON, A. H. SKAER.

five cents each, by addressing the Commissioner of Patents- Washington,D. G.

